On Wed, Jun 25, 2014 at 08:48:32AM +0200, Paolo Bonzini wrote: > It is only slightly better, but the right solution is to fix the driver. > There is absolutely zero reason why a graphics driver should know about the > vendor/device ids of the PCH. There is a very valid reason to know about the PCH since it _is_ part of the gpu. You don't notice this all that much in the driver since the hardware provides magic mmio regions in the main vga device register bar which remap to the relevant PCH register ranges. And an awful lot of other stuff like the MCH. So from an abstract pov you could only pass the intel igt to a guest if you'd forward the gfx device, the mch/host bridge and the pch. Thanks to these magic mmio windows we don't need those, except that someone forgot to forward the pch pci id. So the correct fix to forward intel gpus to guests is indeed to somehow fake the pch pci ids since the driver really needs them. Gross design, but that's how the hardware works. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
